Formatting a hard disk drive (HDD) in an external hard drive enclosure is done the same way like an internal drive. Simply connect the external drive via Thunderbolt, USB, FireWire or eSATA to your computer, turn on the power and then use the native disk utility of the Operating System or a 3rd party program. In case your hard drive enclosure has a built-in RAID controller, make sure to set your preferred RAID mode before you format the hard drives.

Warning:
Removing partitions and formatting a hard drive will destroy all existing data on that particular disk! Make sure you have a backup of all your data in a different location prior to making any changes to the external drive.

 

 

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